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Hi,
this should be possible using a "Filtering" type typology rule. The filter needs to look into the broadlog and compare possibly existing deliveries. Something like this:
You can use the currentDelivery object (it is not selectable in the UI, you have to enter it manually in the advanced screen) to access the delivery that is about to being sent. You should also try to filter most of the audience upfront during targeting and use this rule only as a safety measure.
And lastly you need to test this; the subject attribute is also a hidden field, and I am not sure if it can be used in queries like this for comparison.
Good luck and best regards, Tobias